Great poll.
First I like them a lot and are one of the reason this game got me hook along with the humour of course.
As I said previously, I really like the artwork and the style given to the game. The fact that there is one style and not many give the game a much better look and experience of play.
This is a strong point you should keep as long as possible.
Concerning the girls there are awesome artworks and some a bit less. But, as with all artwork it is also a question of taste.
For example, Kimie was one of the first i level up to see a great cut scene. I was terribly disapointed. Good artwork but quite nothing to watch (if you catch my meaning). But, in the same time i read that people like it lot.
There are too many loose end i should say.
I was thinking to make a suggestion on this. Why not add 2 more affection level (besides, a good way to spend time on the game).
You could add with affection level 4 some background for some girls or loose end (e.g Sheheramazond needs a scene with all those girls ) and a 5th or more if you like with the hero and the girl doing the favorite position of the girl. I think this point should be taken into consideration as it is a key point of the game. And maybe a good challenge for the artists
For Red Battler, it could be great to give her a name at some point. A bit sad you refer to someone with just a nikname. Hence the idea of more affection levels.
And to close this, something i would like is the possibility to switch the pic of a girl at will. Today, i may want to see Bunny with first pic (nah kidding!) and tomorrow with pic 2 or 3 (more likely lol) and so on.
Edit: I forgot to mention. Please add a nose to Juliette AFF3 artowrk. Seeing her like that is quite weird.